Grace Chisholm Young
Born: 15 March 1868 in Haslemere (near London), England
Died: 29 March 1944 in Croydon, Surrey, England
Grace was only six years old when her father retired at the age of 65 and at this time the family moved to Haslemere in Surrey. There she was educated by a governess at home, then at the age of 17 she passed the Cambridge Senior Examination. Following her family's wishes, Grace become involved in social work among poor people in London. She was stopped by her family from studying medicine, the topic of her choice, then decided to enter Girton College, Cambridge in 1889 to study mathematics. At Girton her tutor was William Young. She obtained a first class degree in mathematics in 1892.
The place to go to undertake research in mathematics at that time was Göttingen, which had just set up a course for women, and that is where Grace Chisholm decided to continue her studies. In the reference  a letter she wrote from Göttingen is quoted. In this letter she described Klein's attitude towards women:-
Professor Klein's attitude is this, he will not countenance the admission of any woman who has not already done good work, and can bring proof of the same in the form of degrees or their equivalent ... and further he will not take any further steps till he has assured himself by a personal interview of the solidity of her claims. Professor Klein's view is moderate. There are members of the Faculty here who are more eagerly in favour of the admission of women and others who disapprove altogether.Under Klein's supervision she completed a doctorate in 1895. Her thesis was on The algebraic groups of spherical trigonometry and Klein discusses the results in one of his books.
By this time Chisholm's parents were elderly, her father being 86 years old, so she returned from Germany to England to help look after them. In the following year, on 11 June, she married William Young whom she had met again on her return to England. In fact she turned down his first proposal of marriage and only when he proposed for a second time did she accept. William Young was not a mathematical researcher, but Grace of course was trained in research at Göttingen, so she encouraged her husband to begin his research career. Their first child Frank, who they nicknamed Bimbo, was born in 1897. They lived for a year in Italy where they undertook research in geometry but did not find it particularly exciting. In 1899 they moved to Göttingen where they were encouraged by Klein to work on set theory.
They lived in Göttingen until 1908, and during these years two sons and three daughters were born. Their eldest daughter, Rosalind (whose married name was Rosalind Tanner), achieved fame as a historian of mathematics. In fact William and Grace put considerable effort into teaching their children and several children's books resulted from this. Their joint work A First Book of Geometry, which was on paper folding for children, was published in 1905. Two further children's books authored by Grace, written to introduce children to science, were Bimbo (1906), and Bimbo and the Frogs (1907). We noted above that Bimbo was the nickname the Youngs gave their eldest child Frank. After leaving Göttingen in 1908 they settled in Geneva, Switzerland, where they continued a true mathematical partnership in which both contributed. This is described in detail in . To quote from one letter of William Young to his wife (see  for more details):-
The fact is that our papers ought to be published under our joint names, but if this were done neither of us get the benefit of it. No. Mine the laurels now and the knowledge. Yours the knowledge only. Everything under my name now, and later when the loaves and fishes are no more procurable in that way, everything or much under your name. At present you cannot undertake a public career. You have your children. I can and do.Together William Young and Grace wrote 220 mathematical articles and several books. One of the books The Theory of Sets of Points (1906) was published under their joint names and when Grace Young sent the book to Cantor he replied:-
It is a pleasure for me to see with what diligence, skill and success you have worked and I wish you, in your further researches in this field as well, the finest results, which, with such depth and acuteness of mind on both your parts, you cannot fail to attain.It is almost impossible to tell exactly how much of the work in these papers was due to Grace Young. As William Young wrote himself, in the same letter part of which has already been quoted above:-
I am very happy that you are getting on with the ideas. I feel partly as if I were teaching you, and setting you problems which I could not quite do myself but could enable you to.We mentioned above that Grace had wanted to study medicine when she was young but her parents had been against this. However Grace did study medicine, both in Göttingen and in Geneva but she never took any formal examinations to qualify in the subject. She continued to work on mathematical research and, between 1914 and 1916, she published work on the foundations of calculus under her own name. She wrote an essay on 'infinite derivatives' which won the Gamble Prize from Girton College in 1915. In the same year, although remaining in Switzerland, the Youngs moved from to live near Lausanne. World War I was, however, tragic for them since Frank, who was an airman, was killed in action. The family were devastated by this tragedy and Grace's health began slowly to decline. By the mid 1920s she had stopped her mathematical research.
When World War II began to affect their lives in Switzerland, Grace Young brought two of her grandchildren (children of her daughter Janet) to England early in 1940. Although she had intended to return at once, it became impossible on the fall of France and she had to remain in England. Depressed at being separated, William died in 1942. Grace Young outlived her husband by two years, dying at the home of her daughter Janet in Park Road, Croydon.
Article by: J J O'Connor and E F Robertson
MacTutor History of Mathematics